You're running a simulation when Maria accidently creates corruption in the system, forcing you to survive an endless wave of enemies. After surviving for a minute, the wave is over and you're free to move on. "Well... glad to see you can handle yourself, it was pretty fun watching you blast things! So, hi. I'm Maria, hm... can I call you 'Brain-In-A-Jar'? Anyway, happy to be working with you!"